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10MM Auto

10mm

Introduced in 1983, the 10mm Automatic is the predecessor to the 40 S&W, which is identical in all ways excepting a shorter case and overall length; working pressure is similar for the two. Because it can use about 5% higher pressure and has significantly greater usable case capacity, the 10mm can generate far more energy than the 40 S&W. With the best loads launching the same 180-grain bullets from 4-inch barrels, the 10mm generates almost 25% greater muzzle energy. Despite delivering significant energy and working in the same guns as the 45 Automatic, the 10mm has the advantages of being more controllable because the lighter bullets usually used generate less recoil and with modern designs it offers the shooter more rounds in the magazine when used in guns of equal size.

I personally find a well-tuned Colt Delta Elite to be a wonderful pistol I can shoot well. My friend, Andy Tuttle, let me use his for a night-fighting seminar at the Whittington Center. After firing only one magazine full of ammo, I was enamored with the gun and the chambering.


When loaded with the right bullet, the 10mm is probably the minimum chambering I would feel comfortable carrying in bear country as a means of last resort in case of bear attack, when I would certainly be wondering why I had not brought along a 10-gauge; or, better yet, a howitzer; or, ideally, someone I could outrun!

As with any pistol round headspacing on the case mouth, best practice is to apply a taper-crimp after seating the bullet. This helps to lock the bullet in place against chambering forces that might otherwise drive it into the case. I cannot too-strongly recommend getting a second seating-and-crimping die so you can have one adjusted to seat the bullet and the second adjusted to only taper-crimp the case mouth. Generally, attempting to do both operations in one step is a recipe for damaged and destroyed cases.


The text associated with the cartridge description reflects opinions and conclusions of the author, M.L. (Mic) McPherson. Lee Precision and its employees do not necessarily either agree or disagree with any of his comments. We present these with due deference to his recognized expertise in the firearms field. His acumen extends to handloading and all aspects of ballistics - internal, external, and terminal.
Die Sets
Lee Collet Necksizing 2-Die Set
Lee Full-Length Sizing Die Set
90799 (Carbide 3-Die set)
90965 (Carbide 4-Die set)
Lee Breech Lock Die Set
91880 (Carbide 3-Die set)
91937 (Carbide 4-Die set)
Lee Loader
Single Dies
Full-Length Sizing Die
Carbide Sizing Die
91208
Undersize Sizing Die
90787
Powder through Expanding Die
Charging Die
Seating Die
91187
Factory Crimp Die
90862 (Carbide)
Taper Crimp Die
90782
Inline Bullet Feed Die
91996 (40 CAL)
Die Accessories
Guided Decapper
Case Conditioning Tools
Case Length Gauge and Shell Holder
90127
Quick Trim Die
90193
Presses
Reloader Press (50 RPH)
Hand Press (50 RPH)
Challenger Press (50 RPH)
Classic Cast Press (50 RPH)
Value Turret Press (250 RPH)
Classic Turret Press (250 RPH)
Ultimate Turret Press (250 RPH)
Pro 1000 Press (500+ RPH)
Pro 4000 Press (500+ RPH)
Six Pack Pro Press (500+ RPH)
Shell Plates and Holders
Priming Tool Shell Holder
90023 (SHELL HOLDER #19 )
Universal Press Shell Holder
90004 (R19)
X-Press Shell Holder (APP)
91552 (#19)
Pro 1000 Shell Plate
90669 (#19)
Auto Breech | Pro 4000 Shell Plate
90944 (19)
Six Pack Pro Shell Plate
91852 (19L)
Inline Bullet Feed
Inline Bullet Feed Die
91996 (40 CAL)
Inline Bullet Feed Kit
92008 (40 CAL)
Inline Bullet Feed Magazine
92016 (Large Inline Bullet Magazine)
Bullet Casting
Classic Bullet Sizing Kit
Breech Lock Bullet Sizer and Punch
91521
Bullet Molds

Challenger III

From $117.00

Ultimate Turret Press

From $320.00

Deluxe APP Press Kit

91898

Includes:

  • Press
  • Roller Handle
  • Priming System
  • Universal Case Feeder
  • APP Deprime Kit
  • Bottle Adapter
$155.00

Six Pack Pro Press

From $400.00